1) You can have all the DLC's, the trainer work in every single place and missions.2) Changing armour had a bad effect on the super health in previous versions of the trainerBUUUUTPWizard worked on it and it should work on most combinations now. It's still possible that some armour are buggy, but ME2 code seems to come from another world and fixing it to work on more combinations could break the trainer completely so PWizard decided this version should be the last attempt.

(if you haven't played the game yet : the armour can be a full one (coming from a DLC) or a combination of basic items (the base armour))